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3 years ago

9 ( 3x + 5y - 11x + 8 )

Mathematics

1 answer:

harina [27]3 years ago

7 0

Answer: -72x+45y+72

Step-by-step explanation:

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The Dirk family tips their newspaper carrier for delivering the newspaper. They tip 10% of what they pay for the subscription. T

iragen [17]

Answer:

Step-by-step explanation:

90 percent of 20 = 18

18+20

= 38

4 0

3 years ago

(1/3×2/8)+(5/12-1/4)=?<br><br> 2/3×1=<br><br> Write 9.768 in word form?

Blizzard [7]

(1/3) * (2/8) - (5/12 - 1/4) = 1/12 -2/12 = -1/12

2/3*1=2/3

nine and seven hundred sixty eight
thousandths

8 0

3 years ago

Help me plz. What is 4n-2n=18 ?

Scrat [10]

You are trying to figure out what is n.
so you would move all the terms that contain "n", to the right side and solve the problem to get 9
so n=9

6 0

3 years ago

Read 2 more answers

A 250-gal tank is initially filled with brine (salt-water mixture) containing 100 lb of salt. Brine containing 3 lb of salt per

gulaghasi [49]

Answer:

x(t) = 581.66 lb

Step-by-step explanation:

From the given information:

Consider the salt quantity in the tank at time t be x(t) lb.

∴ the rate of change of salt content in the tank is $\dfrac{dx}{dt}= Rate \ of \ \ inflow - rate \ of \ \ outflow$

where:

the rate of inflow = salt conc. × flow rate = 3 lb/gallon × 7 gallons

=21 lb/s

rate of outflow = salt conc. in the tank × flow rate

= x/250 × 9

= 9x/250 lb/s

∴

$\dfrac{dx}{dt} = 21 - \dfrac{9x}{250}$

$\dfrac{dx}{dt} + \dfrac{9x}{250}= 21$

This is a 1st order linear differentiation,

The integrating factor if $e^{^{ \int \dfrac{9}{250}\ dt}} = e^{^{ \dfrac{9t}{250} }}$

∴

$e^{^{ \dfrac{9t }{250}}} \ \ x(t) = \int 21 e^{\dfrac{9t}{250}} \ dt + C$

$e^{^{ \dfrac{9t }{250}}} \ \ x(t) = 21 \times \dfrac{250}{9}e^{\dfrac{9t}{250}} + C$

$x(t) = \dfrac{1750}{3}+Ce^{^{\dfrac{-9t}{250}}}$ at t = (0) and x(0) = 100 lb

Hence;

$100 = \dfrac{1750}{3}+C$

$C = \dfrac{1750}{3} -100$

$C = - \dfrac{1450}{3}$

∴ $x(t) = \dfrac{1750}{3}-\dfrac{1450}{100}e^{^{\dfrac{-9t}{250}}}$

after time t = 1 minute i.e 60 s

$x(t) = \dfrac{1750}{3}-\dfrac{1450}{100}e^{^{\dfrac{-9 \times 60}{250}}}$

$x(t) = \dfrac{1750}{3}-\dfrac{1450}{100}e^{^{\dfrac{-540}{250}}}$

x(t) = 581.66 lb

5 0

4 years ago

10) $48,000 at 16% for 6 years

ELEN [110]

Answer:

No solution

Step-by-step explanation:

idek

7 0

3 years ago

9 ( 3x + 5y - 11x + 8 )​

9 ( 3x + 5y - 11x + 8 )